# Let's encrypt

* <https://letsencrypt.readthedocs.org/en/latest/using.html#where-are-my-certificates>

## X-Frame

* <https://raymii.org/s/tutorials/HTTP_Strict_Transport_Security_for_Apache_NGINX_and_Lighttpd.html#X-Frame-Options_header>
* <https://developer.mozilla.org/en-US/docs/Web/HTTP/X-Frame-Options>
* <https://tools.ietf.org/html/rfc7034>
